m*a=F-u*m*g S=a*t^2/2 a=2*S/t^2=2*75/10^2=1,5 м/с2 F=m*(a+u*g)=5*10^3*(1,5+0,25*10)=20*10^3 H A=F*S=20*10^3*75=155*10^5 Дж
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m*a=F-u*m*g S=a*t^2/2 a=2*S/t^2=2*75/10^2=1,5 м/с2 F=m*(a+u*g)=5*10^3*(1,5+0,25*10)=20*10^3 H A=F*S=20*10^3*75=155*10^5 Дж